JPH0227796B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in a three-pole adapter plug used to change the diameter of the plug.

A 3-pole adapter plug has a complicated connection structure in which the metal ring that serves as the second pole of the plug part is connected to the metal ring that serves as the second pole of the 3-prong plug of a different diameter that is inserted into the jack part. However, there is a problem in that manufacturing and assembling each part is troublesome.

More specifically, the above-mentioned connection structure connects the metal ring, which becomes the second pole of the plug part, to a cylindrical part with a reduced diameter, the rear end of which enters inside the outer cylindrical sleeve, which becomes the outer pole of the plug part. It has to be made into a special shape to ensure that the spring terminal is pressed against the circumferential surface of the metal ring that becomes the second pole of the three-pole plug of different diameter that is inserted into the jack, and the A means for assembling the spring terminal into the jack part so as to perform a prescribed operation, and a connecting fitting for connecting the spring terminal to the rear end of the outer cylindrical sleeve of the aforementioned plug part are required. Making and assembling the pole adapter plug is extremely troublesome.

The present invention was made in order to solve this problem, and the metal ring that becomes the second pole of the plug part is made into a ring with a simple shape similar to the metal ring that is the second pole of a normal three-pole plug. The purpose of this invention is to manufacture a connecting fitting for connecting this metal ring and a spring terminal integrally and continuously with the spring terminal, and to facilitate their manufacture and assembly. shall be.

In order to achieve this object, the three-pole adapter plug of the present invention has a metal ring serving as the second pole of the plug part, and a part of the inner surface of the metal ring is exposed to the inner cavity of the insulating outer cylinder of the jack part. In the insulating outer cylinder of the jack part, a springy metal plate is punched out and legs protruding from both front and rear ends in a fork shape are provided, so that the overall shape is horizontally oriented.
A connecting terminal plate formed into a mold is pressed into contact with the inner surface of the metal ring on the front end side, and the end of the leg piece on the rear end side is inserted into the socket of the jack part. The three-pole plug is characterized in that the three-pole plug is inserted so as to be in pressure contact with the outer peripheral surface of the metal ring that becomes the second pole, and is assembled and held in the insulating outer cylinder.

Next, an example of implementation will be described in detail with reference to the drawings.

FIG. 1 shows a longitudinal side view of a three-pole adapter plug A in which the present invention can be implemented. In the same figure, a indicates a chip 1 made of a metal material from which a pin 10 serving as an inner pole protrudes from the rear end surface, a metal ring 2 serving as a second pole, and an outer cylinder sleeve 3 made of a metal material serving as an outer pole.
It is a plug part assembled with a synthetic resin material 4 which integrally connects them while insulating them from each other, and b indicates a socket 5 made of a metal material provided on the rear end side and the socket. 5 to 1, there is a holder 6 made of a metal material that holds the three-pole plug B of a different diameter inserted in the inserted state, as shown by the chain line in FIG. The jack part is made up of an insulating outer cylinder 7 that accommodates the body and the connection terminal, and the insulating outer cylinder 7 is mounted inside the outer sleeve 3 forming the body of the plug part a. The inner cavity of the body of the plug part a constitutes a jack part.

The insulating outer cylinder 7 of the jack part b is connected to the plug part a.
When assembled by insert molding using the synthetic resin material 4, the synthetic resin material 4 is molded into an integral and continuous state. Then, on the inner circumferential surface side, fitting grooves 70, 70 and 7 for assembling and holding connection terminal plates c and d, which will be described later during molding, are provided.
1, 71, cutout grooves 72, 72 for exposing a part of the inner surface of the metal ring 2, which becomes the second pole of the plug part a, to the inner cavity of the insulating outer cylinder 7, and the inserted connection. Sleeve e that prevents terminal board c from escaping
A recessed portion 73 for fitting is formed as shown in FIGS. 5 to 7.

That is, as shown in FIG.
Fitting grooves 70, 70 are formed along the entire width from the open opening on the rear end side of the insulating outer cylinder 7 to the front end of the insulating outer cylinder 7 located inside the front end of the outer cylinder sleeve 3. The front ends of the fitting grooves 70, 70 are formed into a molded part 40 of the synthetic resin material 4 that fills the inside of the metal ring 2 of the plug part a, as shown in FIGS. It is continuous with notch grooves 72, 72 formed along the inner circumferential surface of 2. Also,
Fitting grooves 71, 71 parallel to the fitting grooves 70, 70 are provided on the left and right side walls of the inner peripheral surface of the insulating outer cylinder 7.
is formed over the entire width from the open opening on the rear end side of the insulating outer cylinder 7 to the front end of the insulating outer cylinder 7, and the front ends 71a, 71 of the fitting grooves 71, 71 are formed.
a further extends to the inner wall surface of a cavity 40a formed around the protruding end 10a of the pin 10, which becomes the inner pole of the plug section a, at the axial center of the molded part 40, and has an axis on the inner wall surface. It is shaped like a staircase towards the heart.

In order to connect the metal ring 2 serving as the second pole of the plug part a and the metal ring 2' serving as the second pole of the three-pole plug B of the opposite sex inserted from the socket 5 into the jack part b. The connection terminal plate c, which is installed in the insulating outer cylinder 7, is made by punching out a springy metal plate and has leg pieces 80 protruding in a fork shape from both the front and rear ends, respectively, as shown in FIG. 80, 81, 8
1 and is formed into a substantially horizontal H shape. The connection terminal plate c is inserted through the open opening on the rear end side of the insulating outer cylinder 7 with the upper and lower side edges fitted into the upper and lower fitting grooves 70, 70, and is provided on the front end side. Forked leg piece 8
The ends 80a, 80a of 0, 80 are connected to the notch groove 7 formed on the inner surface side of the metal ring 2 of the plug part a.
2, 72, and as a result, as shown in FIG. The ends 81a, 81 of the leg pieces 81, 81 on the rear end side are in pressure contact with the inner circumferential surface of the metal ring 2 of a.
The inner surface of the insulating outer cylinder 7 is brought into pressure contact with the outer peripheral surface of the metal ring 2' of the three-pole plug B with a different diameter that is inserted into the jack part b, and then A sleeve e, which has been separately molded from a synthetic resin material, is press-fitted into the recessed portion 73 and assembled into the insulating outer cylinder 7 in the above state.

The connection terminal plate d is used to connect the protruding end 10a at the rear end of the pin 10, which is the inner pole of the plug part a, to the tip 1' at the tip of the plug B which is inserted into the jack part b. Similar to the connection terminal plate d described above, a springy metal plate is punched out, and fork-shaped leg pieces 90, 90 and 91 are provided at both front and rear ends, respectively, as shown in FIG. 91, and is formed into a substantially horizontal H shape, and on the inner side of the end of the leg pieces 90, 90 on the front end side thereof,
Engagement hooks 90a, 90a are formed to engage with engagement steps formed on the protruding end 10a of the pin 10, which serves as the inner pole of the aforementioned plug portion a.

Then, before inserting the above-mentioned connection terminal plate c into the insulating outer cylinder 7, the connecting terminal plate d is inserted into the fitting grooves 71, 71 from the open opening on the rear end side of the insulating outer cylinder 7.
With the left and right edges fitted together, insert the connection terminal board c in the same way as described above,
The front end portions of the leg pieces 90, 90 on the front end side are connected to the pin 1.
The front end 71 of the fitting grooves 71, 71 provided in the inner wall of the cavity 40a surrounding the rearward projecting end 10a of 0
a, 71a, as shown in FIG.
a, 90a is inserted so that it engages with the engaging stepped portion of the protruding end 10a of the pin 10, so that the ends of the front leg pieces 90, 90 are attached to the pin as shown in FIG. 10, and the inner surfaces of the ends 91a, 91a of the leg pieces 91, 91 on the rear end side are pressed against the outer surface of the tip 1' at the tip of the three-pole plug B to be inserted. It is assembled in perfect condition.

Note that the connection structure for connecting the pin 10, which is the inner pole of the plug a, to the chip 1' at the tip of the three-pole plug B inserted into the jack part b uses a connection terminal plate d. Although conventional means may be used instead, the structure can be simplified by assembling this approximately horizontal H-shaped connection terminal plate d in a state where it crosses the above-mentioned connection terminal plate c in front view. It is valid.

In addition, in the means of the present invention, the means for assembling the connection terminal plate c to the insulating outer cylinder 7 is performed by forming the insulating outer cylinder 7 into two parts along the axial direction and joining them to assemble them into a cylindrical shape. It may be fitted into the inner cavity as desired. Also, plug part a
The metal ring 2 to be installed is formed into a ring shape with cuts along the axial direction, and when molding the main body shown in FIG.
In some cases, the metal ring is molded with the metal ring removed, and after insert molding of the main body part is completed, the metal ring is expanded in diameter and fitted into the metal ring.

Next, to explain the function and effect, the three-pole adapter plug A according to the present invention has the following features:
A metal ring 2 serving as the second pole of the plug part a is installed in such a manner that a part of its inner surface is exposed to the inner diameter of the insulating outer cylinder 7 of the jack part b. The leg pieces 80, 8 are punched out of a springy metal plate and protrude in the shape of a fork from the front and rear ends, respectively.
The ends 80a, 80a of the leg pieces 80, 80 on the front end side of the connecting terminal plate c, which is formed into a substantially horizontal H-shape as a whole and equipped with the terminals 0, 81, 81, are pressed against the inner surface of the metal ring 2. and the leg piece 8 on the rear end side
The ends 81a, 81a of 1, 81 are the second 3-pole plug B of different diameters which are inserted from the socket 5 of the jack part b.
The metal ring 2, which becomes the second pole of the plug part a, and the jack part b are inserted in a state in which they are pressed into contact with the outer peripheral surface of the metal ring 2' which becomes the pole, and are assembled and held in the insulating outer cylinder 7. Since the metal ring 2' which becomes the second pole of the three-pole plug B of different diameters that is inserted into the plug B is connected, the metal ring 2 which becomes the second pole should be formed in a simple shape. In addition, the connection structure is significantly simplified as it is only necessary to insert and assemble one connection terminal plate c formed from a resilient metal plate into the insulating outer cylinder. Makes fabrication and assembly significantly easier.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional side view of a three-pole adapter plug that embodies the present invention, Fig. 2 is a perspective view of the connection terminal plate of the above adapter plug, Fig. 3 is a cross-sectional plan view of the above adapter plug, and Fig. 4 is a cross-sectional view of the adapter plug. FIG. 5 is a cross-sectional plan view of the main body of the adapter plug, FIG. 6 is a longitudinal sectional side view of the main body of the adapter plug, and FIG. Figure 7 shows the fifth part of the same main body.
The sectional view taken along the line A-A in the figure, FIG.
It is a sectional view taken along the line BB in the figure. Explanation of drawing symbols, A... 3-pole adapter plug, B... 3-pole plug with different diameter, a... plug part,
b...Jack part, c, d...Connection terminal board, e...
...sleeve, 1,1'...chip, 10...pin,
10a...protruding end, 2, 2'...metal ring,
3...Outer cylinder sleeve, 4...Synthetic resin material, 40...
...Molding section, 40a...Vacancy, 5...Socket, 6...
Holder, 7... Insulating outer cylinder, 70, 71... Fitting groove, 71a... Front end, 72... Notch groove, 73...
...Indentation part, 80, 81...Leg piece, 80a, 81a
... end, 90, 91 ... leg piece, 90a ... engaging hook, 91a ... end.

Claims (1)

[Claims] 1. A metal ring serving as the second pole of the plug part is installed so that a part of its inner surface is exposed to the inner cavity of the insulating outer cylinder of the jack part, and a spring is installed inside the insulating outer cylinder of the jack part. A connecting terminal plate is formed by punching out a flexible metal plate and having leg pieces protruding in a forked shape at both front and rear ends, respectively, to form an approximately horizontal H-shape as a whole, and the end of the leg piece on the front end side The second part of the three-pole plug with different diameters is in pressure contact with the inner surface of the metal ring, and the end of the leg on the rear end side is inserted into the socket of the jack part.
A three-pole adapter plug characterized in that it is inserted into a state in which it is in pressure contact with the outer peripheral surface of a metal ring serving as a pole, and is assembled and held in the insulating outer cylinder.